32 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Dissolution"  
Results: 1 - 24 next
open access

Tritium storage development. Progress report No. 12, April--June 1977. [In metal hydride; polymer impregnated tritiated concrete]

Description: Laboratory work was continued on hydriding of zirconium sponge and rod under varying conditions of temperature (400 to 900/sup 0/C) and pressure (0-1000 torr) to determine optimum conditions for the formation of hydrides with desirable mechanical properties. Titanium sponge and rod were also hydrided for comparison. Zirconium and titanium samples containing tritium were prepared and initial leach data were obtained. Leach rates for zirconium in distilled water ranged from 1.1 x 10/sup -6/ to 4.… more
Date: January 1, 1976
Creator: Colombo, P
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Kinetics of Quartz Dissolution and Precipitation

Description: Silica precipitation in geothermal power plants and in reservoir formations is considered to be a potential problem area in the successful development of geothermal power from liquid dominated resources. In order to gain insight into the significance of this problem and to estimate the rates of precipitation of silica under varying conditions, a literature review and evaluation was made. Data on the kinetics of quartz dissolution and precipitation in water was fitted to an expression derived fr… more
Date: January 1, 1976
Creator: Apps, J. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Lithium--water--air battery project: progress during the month of May 1976. [Study of Li/Br analog]

Description: A technique was developed for the rapid and accurate determination of current efficiency for lithium dissolution through the measurement of the steady-state, nonequilibrium hydrogen gas evolution rate from closed lithium--water cells. A technique for preparing alloys of lithium through arc melting was developed. The results of the polarization studies on the first set of samples show no marked effect of Ca or Al dopants on film conductivity. A lithium--bromine analog of the lithium--water batte… more
Date: June 3, 1976
Creator: Cooper, J. F.; Hosmer, P. K. & Homsy, R. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effects of impurities on PuO/sub 2/ dissolution in nitric-hydrofluoric acid solutions

Description: The effects of 0.10 M Cu/sup 2 +/, Hg/sup 2 +/, Zn/sup 2 +/, La/sup 3 +/, Ce/sup 3 +/, Al/sup 3 +/, Th/sup 4 +/,Zr/sup 4 +/, Cr/sup 3 +/, and Fe/sup 3 +/ on PuO/sub 2/ dissolution in 8.0M HNO/sub 3/--0.1M HF were investigated. Except for Cr/sup 3 +/ and Fe/sup 3 +/, the amount of Pu dissolved in 1 hour can be predicted by either log C(Pu) = -0.32 log K/sub F/ - 1.53 (K/sub F/ = first stability constant for the impurity metal fluoride complex) or log C(Pu) = -0.5 Z/sup 2//d-1.11 (Z = ionic charg… more
Date: January 1, 1976
Creator: Tallent, O. K. & Mailen, J. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Dissolution rates of /sup 238/PuO/sub 2/ and /sup 239/PuO/sub 2/ in 1M perchloric acid

Description: The dissolution rate of /sup 238/PuO/sub 2/ and /sup 239/PuO/sub 2/ in 1M HClO/sub 4/ was measured over a period of 200 days. When equal (150-..mu..g/l) masses of the oxides were compared, /sup 238/Pu was found to be released approximately five times faster than /sup 239/Pu. At the 10-..mu..Ci/ml activity level, /sup 238/Pu was released 100 times faster than /sup 239/Pu. The difference in dissolution rates is attributed to the difference in alpha particle specific activity of the two materials … more
Date: December 1, 1976
Creator: Matlack, G. M.; Patterson, J. H.; Nelson, G. B. & Waterbury, G. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Correlation of radionuclide leachabilities with microstructures of glasses containing Savannah River Plant waste

Description: Leachabilities of cesium and strontium from the glass matrices were correlated with the microstructures of glasses containing waste sludge from two SRP waste tanks. All sludge components, except mercury which volatilized, were completely soluble in the melt, but small amounts of crystalline iron oxide precipitated during cooling. These precipitates were less leachable than the glass matrix. Even though the compositions of the two sludges that were tested were similar, glass containing one of th… more
Date: May 1, 1976
Creator: Kelley, J. A. & Rankin, W. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Transport aspects of electrochemical machining and electrometallurgy

Description: Transport processes in large measure determine the rate at which electrolytic metal deposition and dissolution can be conducted. Unusually high rates, often accompanied by the formation of solid reaction products, are achieved in electrochemical machining by the use of high electrolyte flow velocities between closely-spaced electrodes. Geometrical shape and surface finish resulting from deposition or dissolution reactions are determined by the current distribution on a macroscopic and microscop… more
Date: May 1976
Creator: Muller, Rolf H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Potentiometric determination of sulfate with EDTA and the cupric-selective electrode

Description: Sulfate was indirectly determined by precipitating sulfate as BaSO/sub 4/ and then dissolving BaSO/sub 4/ in excess ammoniacal EDTA. The excess EDTA was titrated potentiometrically with La/sup 3 +/. A cupric-selective electrode was used to detect the end point. About 10/sup -3/M SO/sub 4//sup 2 -/ was determined in 3M HCl solutions of metal oxides with a relative standard deviation of 3.5 percent and a bias of +4 percent.
Date: November 1, 1976
Creator: Baumann, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radiochemical studies for the nuclear chemical mining of copper. [Nuclear explosive fracturing]

Description: Experiments were performed to study the long-term reactions of radioactive materials that would be produced in the nuclear chemical mining of chalcopyrite copper ore. These reactions were carried out in autoclaves for up to eight months at 2.76 MPa of oxygen and 363 K. Dissolving rates of radioactive glass in copper-leaching product solutions were determined by the gamma-counting of solution aliquots. The glass decomposition rate was linear at approximately 1 x 10/sup -10/ kg/s.m/sup 2/. A radi… more
Date: February 19, 1976
Creator: Jackson, D. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Dissolution processes. [224 references]

Description: This review contains more than 100 observations and 224 references on the dissolution phenomenon. The dissolution processes are grouped into three categories: methods of aqueous attack, fusion methods, and miscellaneous observations on phenomena related to dissolution problems. (DLC)
Date: October 22, 1976
Creator: Silver, G. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Tritium storage development. Progress report No. 9, July--September 1976. [Tritiated concrete-polymer]

Description: Lysimeter testing of the polymer impregnated tritiated concrete (PITC) specimens at the Savannah River Plant has continued. After thirty-one weeks, a constant average tritium fraction release rate of 1.16 x 10/sup -6/ day/sup -1/ was reached in the percolate water with no measurable release into the air. Data from this experiment projected to long-term tritium releases estimate that a complete tritium release from the PITC will require 2,370 years and that the maximum fraction of the initially … more
Date: January 1, 1976
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Assessment and control of environmental contamination from trace elements in coal processing wastes

Description: Environmental problems associated with discarded refuse from coal cleaning and processing are recognized, including waste-bank instability, acid drainage from disposal areas, and noxious emissions from burning wastes. EPA, and other organizations, support efforts to develop methods for controlling forms of environmental contamination. Attention has turned to the environmental hazards posed by the vast array of potentially harmful trace elements in coal refuse materials. It is established that m… more
Date: January 1, 1976
Creator: Wewerka, E. M.; Williams, J. M. & Wanek, P. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hot cell studies of light water reactor fuel reprocessing. [Radioactivity distribution; dissolution; extraction; waste evaporation]

Description: Experiments were run using all-glass equipment with irradiated fuel in a hot cell, in order to study possible problems in LWR fuel reprocessing (radioactivity distribution during dissolution, stability of extraction raffinate, waste partitioning). Behavior of /sup 129/I, tritium, and /sup 14/C in the off-gas was studied, as were the radioisotopes in the dissolver solution; results are compared with ORIGEN calculations. Actinide mass analyses were also made and compared with ORIGEN. Residues and… more
Date: January 1, 1976
Creator: Campbell, D. O. & Buxton, S. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Glass and ceramic materials for the immobilization of megacurie- amounts of pure cesium-137. [In glass, glass-ceramics, zeolite, and pollucite]

Description: Megacurie-amounts of radioactive cesium (/sup 137/Cs and /sup 134/Cs) can be satisfactorily incorporated in a variety of ceramic forms including glass, glass-ceramics, cesium-loaded zeolites, and the mineral pollucite. Glasses which contain up to 45 percent Cs/sub 2/O can be prepared having leach rates in distilled water at 25/sup 0/C in the range 2 x 10/sup -5/ to 3 x 10/sup -3/ g Cs/cm/sup 2//day. Attempts to produce glass ceramics containing pollucite failed to yield a glass that crystallize… more
Date: April 1, 1976
Creator: Strachan, D. M. & Schulz, W. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

LWR fuel reprocessing and recycle program. Quarterly report, July 1--September 30, 1976. [Shear; voloxidation; dissolution; Purex; off-gas adsorption; MOX fuel fabrication; environmental impact]

Description: Two additional dissolutions were made using irradiated fuel for the H.B. Robinson II reactor; the solids are being characterized. An extension of time was given for bid proposals for a model /sup 1///sub 2/-ton/day voloxidizer. Preliminary heat transfer tests of a rotary kiln voloxidizer were completed. Residence times were measured in a 6-in. dia. tube; results were in agreement with those obtained in a previous test with a commercial kiln. The remaining fluorocarbon adsorption process pilot-p… more
Date: November 1, 1976
Creator: Vondra, B. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Corrosion engineering in the utilization of the Raft River geothermal resource

Description: The economic impact of corrosion and the particular problems of corrosion in the utilization of geothermal energy resources are noted. Corrosion is defined and the parameters that control corrosion in geothermal systems are discussed. A general background of corrosion is presented in the context of the various forms of corrosion, in relation to the Raft River geothermal system. A basic reference for mechanical design engineers involved in the design of geothermal energy recovery systems is prov… more
Date: August 1, 1976
Creator: Miller, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation into the dissolution and direct assay of high-fired plutonium dioxide. [Fusion-melt with potassium pyrosulfate and sodium peroxide]

Description: A fusion-melt and dissolution assay method has been developed and tested for the quantitative analysis of high-fired plutonium dioxide. The method employs fusion of the plutonium dioxide at temperatures greater than the melting point of an eutectic mixture of potassium pyrosulfate plus sodium peroxide. The resultant melt is then titrated directly by either controlled potential coulometry or a gravimetric titration, using standardized ceric sulfate as the titrant. It has been concluded from thes… more
Date: April 10, 1976
Creator: Patterson, J. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Study of the extractability of alumina from fly ash by the lime-sinter process. [78 refs. ; appendix]

Description: The exploratory work combined with the derived results made it possible to reach the following conclusions. Magnetic separation of fly ash in water will dissolve all the sulfur contained in the original fly ash. Although it will recover less iron in the magnetic fraction than the wet separation, the dry separation is more convenient. It is not necessary to use a very high pressure to make pellets, since the alumina recovery percentage does not increase with the pressure. A pressure of 8000 psi … more
Date: June 1, 1976
Creator: Chou, K. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of cementitious grouts for the incorporation of radioactive wastes. Part 2. Continuation of cesium and strontium leach studies. [Hydrofracture]

Description: Additional leach studies were completed on the leachability of cesium and strontium from simulated hydrofracture grout. These studies followed the test method proposed by IAEA or a modification which exposed smaller specimens with a higher surface-to-volume ratio to a larger volume of leachant. Results showed that the amount of cesium or strontium leached from the grout varied directly with the degree of drying during curing and inversely with the time of curing. The leachability also depends o… more
Date: September 1, 1976
Creator: Moore, J. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Tritium storage development. Progress report No. 8, April--June 1976

Description: Lysimeter testing of polymer impregnated tritiated concrete (PITC) specimens at the Savannah River Laboratory (SRL) has continued. After twenty-three weeks, an average tritium fraction release rate of 3.37 x 10/sup -7/ day/sup -1/ has been determined in the percolate water with no measurable release to the air. Data from this experiment is extrapolated to estimate long-term tritium releases. A duplicate PITC specimen is in static leaching in distilled water. After seventy-two days, the average … more
Date: January 1, 1976
Creator: Colombo, P. (ed.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Geologic study of the interior Salt Domes of Northeast Texas Salt-Dome basin to investigate their suitability for possible storage of radioactive waste material

Description: The purpose of this study was to investigate the movement and hydrologic stability of the domes, to identify the domes which appear suitable for further study and consideration, and to outline the additional information needed to evaluate these domes. The growth of the interior salt domes appears to have slowed with geologic time and to have halted altogether. The Bullard, Whitehouse, and Keechi domes probably are not subject to significant dissolution at the present time. However, caprock foun… more
Date: May 1, 1976
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analytical methods for fissionable materials in the nuclear fuel cycle. Progress report, July 1, 1975--September 30, 1976

Description: Progress continued on development of dissolution techniques for difficult-to-dissolve nuclear materials, development of methods and automated instruments for determinations of plutonium and uranium, preparation of plutonium-containing materials for the Safeguards Analytical Laboratory Evaluation (SALE) program, analysis of SALE uranium materials, and measurement of plutonium isotope half-lives. Gas-solid reactions at elevated temperatures using reactive gases such as chlorine continue to show p… more
Date: December 1, 1976
Creator: Waterbury, G. R. (comp.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Control of hydrogen sulfide emission from geothermal power plants

Description: A process for controlling H/sub 2/S emissions at geothermal power plants was evaluated in laboratory scale equipment and by process engineering analysis. The process is based on scrubbing geothermal steam with a metal salt solution to selectively remove and precipitate the contained H/sub 2/S. The metal sulfide is roasted or oxygen/acid leached to regenerate the metal salt, and sulfur is rejected from the system as elemental sulfur or as sulfate. Up to 95 percent removal of H/sub 2/S from simul… more
Date: July 1, 1976
Creator: Harvey, W. W.; Brown, F. C. & Turchan, M. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen